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arXiv 1812.00529hep-thcond-mat.str-elquant-ph
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多尺度纠缠重正化的几何解释

Geometric interpretation of the multi-scale entanglement renormalization ansatz

Ashley Milsted, Guifre Vidal

摘要:

多尺度纠缠重正化模型(MERA)是一种描述临界量子自旋链基态的张量网络表示,其网络在对应于尺度的额外维度上延伸。多年来,几位作者在全息和宇宙学的背景下都证实,MERA实现了一些几何的离散版本。然而,虽然一个提议认为张量网络应该被解释为代表双曲平面,但另一个提议却将MERA等同于德西特时空。在这个\letter中,我们使用路径积分几何[A. Milsted,G. Vidal,arXiv:1807.02501],可以将实数线(和有限圆)上的MERA严格解释为二维几何形状,即光片(相应地,光锥)。因此,MERA既不描述双曲平面,也不描述德西特时空。然而,我们也提出了欧几里德和洛伦兹广义MERA对应的路径积分这两个几何。

英文摘要:

The multi-scale entanglement renormalization ansatz (MERA) is a tensor network representation for ground states of critical quantum spin chains, with a network that extends in an additional dimension corresponding to scale. Over the years several authors have conjectured, both in the context of holography and cosmology, that MERA realizes a discrete version of some geometry. However, while one proposal argued that the tensor network should be interpreted as representing the hyperbolic plane, another proposal instead equated MERA to de Sitter spacetime. In this \letter we show, using the framework of path integral geometry [A. Milsted, G. Vidal, arXiv:1807.02501], that MERA on the real line (and finite circle) can be given a rigorous interpretation as a two-dimensional geometry, namely a light sheet (respectively, a light cone). Accordingly, MERA describes neither the hyperbolic plane nor de Sitter spacetime. However, we also propose euclidean and lorentzian generalizations of MERA that correspond to a path integral on these two geometries.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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